Troxler Enhanced RoadReader Plus 3451, Manual Of Operation And Instruction

Page: 99 / 247

5–14
TARGET
Target values include Proctor, percent air voids, Marshall, and
voidless density values.
The gauge uses the Proctor value to calculate the compaction level
when taking counts in the
Soil mode. The gauge uses the specific
gravity of the material to calculate percent air voids and void ratio.
The gauge uses a default value of 2.7, which may not be appropriate
for all soil types. If the true percent air voids is desired, a specific
gravity for the soil being measured must be entered.
The gauge uses the Marshall and/or voidless density values to
calculate the compaction level in the
Asphalt and Thin Layer modes.
The voidless density is the maximum theoretical density for the test
material as obtained in laboratory tests.
The gauge uses the target values to determine the percent
compaction after it has determined the density of the test material.
The Target function enables the operator to enter and store a new
target value, as well as to view, erase, enable, or disable a stored
value. To access this function, press the
〈
Target
〉
button on the
main menu (see Figure 3–11). Depending on the current
measurement mode (
Soil , Asphalt , or Thin Layer ), the PDA displays
one of the two menus shown in Figure 5–14.
In Soil mode, the Target Menu is used to enter, view, erase,
enable, or disable Proctor and percent air void values. In the Asphalt
and Thin Layer modes, the Target Menu is used to manage the
Marshall and voidless density values. To manage a target value,
press the corresponding button on the
Target Menu
. The PDA
displays a menu similar to the one shown in Figure 5–15.
NOTE
Because the menus for managing the Proctor, percent
air voids, Marshall, and voidless density values are
essentially the same, the following sections describe only
the
Proctor Value Menu .